CN104467811A - Anti-interference on-off input circuit - Google Patents
Anti-interference on-off input circuit Download PDFInfo
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- CN104467811A CN104467811A CN201410603339.0A CN201410603339A CN104467811A CN 104467811 A CN104467811 A CN 104467811A CN 201410603339 A CN201410603339 A CN 201410603339A CN 104467811 A CN104467811 A CN 104467811A
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Abstract
The invention relates to an anti-interference on-off input circuit. The circuit comprises an interference pulse absorption module, a residual pulse suppression module, a partial voltage filtration module and an optocoupler isolation transmission module, wherein the interference pulse absorption module, the residual pulse suppression module, the partial voltage filtration module and the optocoupler isolation transmission module are connected in sequence. The circuit has the advantages that anti-interference-pulse capacity is high, the circuit structure is simple, no software needs to perform extra processing on interference pulses, and influences of the interference pulses on the on-off input acquisition circuit can be effectively eliminated.
Description
Technical field
The present invention relates to a kind of anti-interference switch amount input circuit, belong to field of relay protection in power.
Background technology
Along with the development of power electronic technology, the application of power automatic device is increasingly extensive.In electric device, the application of switch acquisition is very general.For microcomputer protecting device; the detection of switching value is very important; switching value refers to that microprocessor obtains deciliter state of primary equipment in microcomputer protecting device place switch cubicle by testing circuit, and the isallobaric device of high temperature gas, motor apparatus abnormality.Therefore the feature of switching value is two value informations, namely opens or closes, 0 or 1, and the low and high level input variable finally converting that microprocessor IO pin can read to.
Switching value input circuit general at present adopts the mode of electric resistance partial pressure, capacitor filtering, Phototube Coupling.But just have problems when distance switch amount detects: in distribution system, there is the switching value that some directly act on signal outlet and tripping operation, the such as temperature of primary power distribution transformer equipment, the node that the non-electrical sensors such as gas export, these Node distribution are in transformer body, distant with power distribution cabinet (hundreds of rice can be reached), and electromagnetic environment is severe, due to the existence of distributed capacitance, the existence of control cables crosstalk, factors such as exchanging the impact that is mixed into is there is time driving power voltage especially uses AC driven power, when certain transmission lines cable does not have an on-off model, transmission cable plays the effect of an antenna, on-off model around in other cables or other disturbing factors in environment can by distributed capacitance inductive coupling to the switching value inputs closing on loop to this cable, generation can reach tens volts of induced voltages to upper hectovolt, photoelectric coupled circuit is driven to produce crosstalk pulse signal, when interference reaches some strength, acquisition circuit can think crosstalk pulse by mistake on-off model, cause the misjudgment of switching value.These node once motions, will start the non-ionizing energy loss element in Microcomputer Protection simultaneously, realize tripping operation.Therefore distance switch amount testing requirement reliability is high, otherwise easily causes malfunction.
In order to solve the problem, existing following several way:
Increase time delay debounce and confirm function, avoid that time of interference.Chinese patent literature CN203056577 has made the unipolarity optocoupler in Chinese patent literature CN202586326 into bipolarity optocoupler, meet be applicable to exchange open into demand, solve the problem that long distance wiring causes interchannel interference completely.Real debounce mode is summed up as software debounce, the connection pin of timing scan optocoupler and microprocessor is used in software program, when low level being detected, microcontroller starts timing, after timing to some time, again detect that microcontroller respective pin is that low level is then thought and opened into effectively, otherwise think interference signal.This time of delay clearly directly affects the response time of opening into semaphore.
Improve the drive current threshold in switch acquisition loop, escape the electric current of interference; Or improve the driving voltage threshold in switch acquisition loop, escape interference voltage.Such as, increase voltage-stabiliser tube in Chinese patent literature CN101436343A to arrange the mode of input voltage threshold, can only interference volume below filtering input threshold; And for close to or exceed normal input voltage interference volume without any effect.
Change dry contact into changeover contact, do not have during signal, switch acquisition loop positive input to be connected by normally closed contact with DC-.In Chinese patent literature CN102809680, use this scheme in every bar switching value transmission loop, increase one need transmit the cable of DC-signal, not only increase cost, when especially long distance wiring, cost increase effect is more obvious; And when acquisition circuit anode is connected with switching value DC-, due to the wiring of long distance, and the existence of coupling capacitance between the lines, keep equal time acquisition circuit two terminal potential can not ensure to be interfered pulse always, or can voltage be produced, thus cause erroneous judgement.
Summarize above way and have limitation, all fundamentally can not solve interference problem.
Summary of the invention
The object of this invention is to provide a kind of anti-interference switch amount input circuit, can not effectively avoid or eliminate DC220V side due to long range propagation and other power lines to walk abreast the problem of laying and producing a large amount of interference in order to solve intake buffer circuit in prior art.
For achieving the above object, the solution of the present invention comprises a kind of anti-interference switch amount input circuit, this input circuit comprises disturbing pulse absorption module, residual pulse suppression module, divider filter module and light-coupled isolation transport module, and disturbing pulse absorption module, residual pulse suppression module, divider filter module are connected successively with light-coupled isolation transport module.
An anti-reverse protection module is also provided with between divider filter module and light-coupled isolation transport module.
Disturbing pulse absorption module is connected between two transmission lines, and disturbing pulse absorption module is the series circuit of resistance R1, diode D1, electric capacity C1, and resistance R2 is at least in parallel with electric capacity C1.
Residual pulse suppression module comprises two ferrite beans, and ferrite bean is separately positioned on two transmission lines.
The present invention adopts disturbing pulse absorption module, can be absorbed reliably by this module to disturbing pulse, in addition, carries out reprocessing, effectively ensure that the reliability of the transmission of normal switch amount signal by the switching value of follow-up a series of modules to transmission.
The present invention has that anti-interference pulse ability is strong, circuit structure simply, does not need software to do the advantages such as extra process for disturbing pulse aspect, effectively can eliminate the impact of disturbing pulse switch amount input acquisition circuit.
Accompanying drawing explanation
Fig. 1 is present system block diagram;
Fig. 2 is execution mode one structural representation of disturbing pulse absorption module;
Fig. 3 is execution mode two structural representation of disturbing pulse absorption module;
Fig. 4 is execution mode three structural representation of disturbing pulse absorption module;
Fig. 5 is the execution mode structural representation of divider filter module;
Fig. 6 is integrated circuit figure of the present invention.
Embodiment
Below in conjunction with accompanying drawing, the present invention will be further described in detail.
A kind of anti-interference switch amount input circuit, comprises disturbing pulse absorption module, residual pulse suppression module, divider filter module and light-coupled isolation transport module; Disturbing pulse absorption module, residual pulse suppression module, divider filter module are connected successively with light-coupled isolation transport module.
Based on above technical scheme, by reference to the accompanying drawings, provide with next embodiment.
As shown in Figure 1, anti-interference switch amount input circuit provided by the invention comprises the disturbing pulse absorption module, the residual pulse suppression module that connect successively, divider filter module, anti-reverse protection module and light-coupled isolation transport module.
Disturbing pulse absorption module comprises 2 resistance, 1 diode and 1 electric capacity; residual pulse suppression module comprises 2 ferrite beans; divider filter module comprises 3 resistance and 1 electric capacity, and anti-reverse protection module comprises 1 diode, and light-coupled isolation transport module comprises 1 optocoupler.
In disturbing pulse absorption module execution mode one as shown in Figure 2, resistance R1, diode D1, electric capacity C1 connect successively, and electric capacity C1 two ends parallel resistance R2, resistance R1 end connects the KR end on transmission circuit, and electric capacity C1 holds the KR-COM end connected on transmission circuit.
In disturbing pulse absorption module execution mode two as shown in Figure 3, diode D1, resistance R1, electric capacity C1 connect successively, the positive pole of electric capacity C1 two ends parallel resistance R2, diode D1 connects the KR end on transmission circuit, and electric capacity C1 holds the KR-COM end connected on transmission circuit.
In disturbing pulse absorption module execution mode three as shown in Figure 4, diode D1, resistance R1, electric capacity C1 connect successively, the series arm two ends parallel resistance R2 of resistance R1 and electric capacity C1, the positive pole of diode D1 connects the KR end on transmission circuit, and electric capacity C1 holds the KR-COM end connected on transmission circuit.
The ability of the absorption interference of this disturbing pulse absorption module is determined by the parameter of R1, D1, C1, R2.
In divider filter module execution mode as shown in Figure 5, one end of resistance R3 is No. 1 input endpoint of divider filter module, the other end of resistance R3 is connected with one end of one end of resistance R5 and electric capacity C2, as No. 3 exit points of divider filter module, the other end of resistance R5 and the other end of electric capacity C2 are connected with one end of resistance R4, as No. 4 exit points of divider filter module, the other end of resistance R4 is No. 2 input endpoints of divider filter module.
Physical circuit figure of the present invention as shown in Figure 6, disturbing pulse absorption module is connected between the KR end of transmission circuit and KR-COM end, KR end and KR-COM end are connected to one end of ferrite bean L1 and L2 of residual pulse suppression module inside respectively simultaneously, the other end of ferrite bean L1 connects No. 1 input endpoint of divider filter module, the other end of L2 connects No. 2 input endpoints of divider filter module, 3 of divider filter module, the diode D2 in anti-reverse protection module is connected between No. 4 exit points, connect the two ends of the photoelectrical coupler OP1 interior light emitting diodes of photoelectric coupling transport module simultaneously, the two ends of the phototriode of photoelectrical coupler OP1 connect the testing circuit of user's microcontroller.
This anti-interference switch amount input circuit does not have the strong drive source of continuous print (compared with the drive source normally opened) mainly for disturbing pulse, and for tufted occur characteristic Design.When this anti-interference switch amount input circuit is subject to surge voltage or power frequency interference signals interference, disturbing pulse enters into disturbing pulse absorption module, and disturbing pulse is charged in the mode of electric charge to capacitor C1 by resistance R1, diode D1; When after first bunch of disturbing pulse blackout, capacitor C1 is discharged by resistor R2, prepares for absorbing disturbing pulse next time.When normally open be applied to jamproof switching value input circuit into signal time, due to signal source power comparatively strong (relative to interference source), the electric capacity C1 of disturbing pulse absorption module inside can be full of, open after signal processed by the disturbing pulse of residual pulse suppression module to remnants, through the divider filter of divider filter module, final in the photoelectrical coupler OP1 of photoelectric coupling transport module, after photoelectric coupling, the input pin being sent to microprocessor into signal will be opened normally.Anti-reverse protection module plays protection photoelectrical coupler interior light emitting diodes.
In present embodiment:
The maximum operating currenbt of ferrite bean L1, L2 is 500 milliamperes, and the equivalent impedance under ambient temperature 20 degrees Celsius and frequency 1 GHz is 600 ohm.
The resistance of resistance R1 is 1 kilo-ohm, and power is 2 watts.
The resistance of resistance R2 is 100 kilo-ohms, and power is 2 watts.
The resistance of resistance R3 and R4 is 68 kilo-ohms, and power is 2 watts.
The resistance of resistance R5 is 1 kilo-ohm, and power is 0.5 watt.
The rated voltage of electric capacity C1 is interchange 630 volts, and specified capacitance is 470 nanofarads.
The rated voltage of electric capacity C2 is interchange 50 volts, and specified capacitance is 100 nanofarads.
The model of diode D1 is GP02-40.
The model of diode D2 is 1N4007.
The model of optocoupler OP1 is TLP185GB.
Be presented above concrete execution mode, but the present invention is not limited to described execution mode.Basic ideas of the present invention are above-mentioned basic scheme, and for those of ordinary skill in the art, according to instruction of the present invention, designing the model of various distortion, formula, parameter does not need to spend creative work.The change carried out execution mode without departing from the principles and spirit of the present invention, amendment, replacement and modification still fall within the scope of protection of the present invention.
Claims (4)
1. an anti-interference switch amount input circuit, it is characterized in that, described input circuit comprises disturbing pulse absorption module, residual pulse suppression module, divider filter module and light-coupled isolation transport module, and described disturbing pulse absorption module, residual pulse suppression module, divider filter module are connected successively with light-coupled isolation transport module.
2. anti-interference switch amount input circuit according to claim 1, is characterized in that, is also provided with an anti-reverse protection module between described divider filter module and light-coupled isolation transport module.
3. anti-interference switch amount input circuit according to claim 1 and 2, it is characterized in that, described disturbing pulse absorption module is connected between two transmission lines, and disturbing pulse absorption module is the series circuit of resistance R1, diode D1, electric capacity C1, and resistance R2 is at least in parallel with electric capacity C1.
4. anti-interference switch amount input circuit according to claim 1 and 2, is characterized in that, described residual pulse suppression module comprises two ferrite beans, and described ferrite bean is separately positioned on two transmission lines.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410603339.0A CN104467811A (en) | 2014-10-31 | 2014-10-31 | Anti-interference on-off input circuit |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410603339.0A CN104467811A (en) | 2014-10-31 | 2014-10-31 | Anti-interference on-off input circuit |
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| CN104467811A true CN104467811A (en) | 2015-03-25 |
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| CN201410603339.0A Pending CN104467811A (en) | 2014-10-31 | 2014-10-31 | Anti-interference on-off input circuit |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106100627A (en) * | 2016-07-13 | 2016-11-09 | 中国电子科技集团公司第三十八研究所 | A kind of the switching on and shutting down of impulse response can split control circuit |
| CN106199123A (en) * | 2016-08-26 | 2016-12-07 | 广州智光自动化有限公司 | A kind of wide-voltage switch amount collection isolation circuit |
| CN109174597A (en) * | 2018-10-25 | 2019-01-11 | 深圳市洁盟清洗设备有限公司 | Ultrasonic wave generative circuit and ultrasonic cleaning cup |
| CN109712845A (en) * | 2019-02-02 | 2019-05-03 | 保定博为世能电气有限公司 | A kind of relay reception switching value raising input power anti-jamming circuit |
| CN113541460A (en) * | 2021-07-20 | 2021-10-22 | 珠海格力电器股份有限公司 | Power supply circuit, remote controller and system |
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| US20090015169A1 (en) * | 2007-07-12 | 2009-01-15 | Atc Altex Technology Corporation | Method for Driving an LED |
| CN203027250U (en) * | 2012-12-26 | 2013-06-26 | 于广沅 | Pulse width modulation signal isolation conversion electric signal output module |
| CN203561848U (en) * | 2013-10-30 | 2014-04-23 | 天津市津达执行器有限公司 | Heavy-current switching value control circuit for electric execution mechanism |
| CN104093245A (en) * | 2014-07-03 | 2014-10-08 | 广东良得光电科技有限公司 | Efficient isolation type LED drive circuit |
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2014
- 2014-10-31 CN CN201410603339.0A patent/CN104467811A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20090015169A1 (en) * | 2007-07-12 | 2009-01-15 | Atc Altex Technology Corporation | Method for Driving an LED |
| CN203027250U (en) * | 2012-12-26 | 2013-06-26 | 于广沅 | Pulse width modulation signal isolation conversion electric signal output module |
| CN203561848U (en) * | 2013-10-30 | 2014-04-23 | 天津市津达执行器有限公司 | Heavy-current switching value control circuit for electric execution mechanism |
| CN104093245A (en) * | 2014-07-03 | 2014-10-08 | 广东良得光电科技有限公司 | Efficient isolation type LED drive circuit |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106100627A (en) * | 2016-07-13 | 2016-11-09 | 中国电子科技集团公司第三十八研究所 | A kind of the switching on and shutting down of impulse response can split control circuit |
| CN106100627B (en) * | 2016-07-13 | 2023-02-03 | 中国电子科技集团公司第三十八研究所 | But impulse response's switching on and shutting down branch puts control circuit |
| CN106199123A (en) * | 2016-08-26 | 2016-12-07 | 广州智光自动化有限公司 | A kind of wide-voltage switch amount collection isolation circuit |
| CN109174597A (en) * | 2018-10-25 | 2019-01-11 | 深圳市洁盟清洗设备有限公司 | Ultrasonic wave generative circuit and ultrasonic cleaning cup |
| CN109712845A (en) * | 2019-02-02 | 2019-05-03 | 保定博为世能电气有限公司 | A kind of relay reception switching value raising input power anti-jamming circuit |
| CN113541460A (en) * | 2021-07-20 | 2021-10-22 | 珠海格力电器股份有限公司 | Power supply circuit, remote controller and system |
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Application publication date: 20150325 |